West Sussex · England
Sompting Window Mastic
Mastic around window and door frames, sills and patio doors for homeowners, landlords and businesses in Sompting. Fully insured, ARBOMaster approved and guaranteed for a year.
- Water coming in at the bottom corners of a door
- Untidy mastic left by window fitters
- Mastic that is falling out in pieces
Window mastic in Sompting, done properly
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that cannot flex, so we fit backing rod to set the right depth. That way the new bead bonds to the frame and the wall only. We work on uPVC windows, window sills and composite doors, and common reasons people get in touch are hard, cracked sealant around windows and white mastic on grey or black frames.
Many houses in smaller places like Sompting have conservatories, garden rooms or patio doors. Their glazing joints and frame seals are as much a part of the job as the windows.
You’re covered for a year from the day we finish. If anything is not right with it, call 0345 464 0079 or email us.
- Where
- Sompting (BN15)
- Wider area
- West Sussex
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Sompting homes and the weather
Sompting is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on the mastic around window and door frames, especially on the side facing the sea. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Rented homes near Lancing station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. If you live in an older home near St Peter the Apostle, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Sompting is about 3 miles east of Worthing, in West Sussex. Anywhere in BN15, we can carry out window mastic at your property. Across West Sussex, we cover 371 places, Sompting among them. There’s also a page for Brighton, about 9 miles away.
Here we cover the BN15 postcode area for window mastic. That includes homes and businesses on Osborne Drive, Western Road North and Osborne Close and the roads around them. Close by, we work in Lancing (1 mile east), East Worthing (1 mile south), Broadwater (2 miles west), Offington (2 miles west) and Salvington (3 miles west). We also work in nearby towns such as Bognor Regis (15 miles west), Burgess Hill (13 miles north-east), Littlehampton (9 miles west), Shoreham-by-Sea (3 miles east), Rustington (8 miles west) and Storrington (8 miles north-west).
Around Sompting
Locally, jobs take us to homes and businesses close to Sompting Abbotts Preparatory School, Brooklands Park and The Sir Robert Woodard Academy. The nearest railway station is Lancing station, about 0.8 miles south-east of the centre. Nearby you will also find Old Castle (2.4 miles west) and Museum of Sussex Folklore (2.5 miles west). Open spaces near Sompting include Lancing Ring and Widewater Lagoon.
What the job involves on each surface
Patio & French doors
Patio and French doors have the longest joints on most houses. The threshold and the bottom corners take the most water, so they get particular care.
Composite doors
Front doors take the weather head on. We pay most attention there.
How we quote for window mastic
For a quick quote, just ask. What matters most is:
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- Mould in or behind the old joints
- The number and length of the joints
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Ask us for a quote and we’ll go through it with you.
What we need to know
Photos help, but a description is a good start. Please mention:
- Where the job is, and your postcode
- How we’d reach the joints
- Roughly how big the job is
- Any previous sealing or DIY work
Every job is quoted individually, so the first step is telling us about yours. Simply call 0345 464 0079 or send us an email and describe the job.
Landlord and commercial work in Sompting
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we’re fully insured for the work.
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Why act early in Sompting
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. A professional job is cut out properly, backed where needed and finished neatly, in a sealant suited to the wall. Homes in smaller places like Sompting can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
Why choose Mr Mastic in Sompting
- We never seal over old sealant
- Quality sealants from Arbo and Everbuild
- White, clear, grey or coloured to suit, where the product allows
- 180+ five-star Google reviews
Take a look at how sealant jobs are priced and our reviews.
Questions from Sompting
Will you come out to Sompting?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you work for landlords with property near Lancing station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear price.
Will resealing my frames help with draughts?
If the draught is coming in around the frame, yes. If it’s coming through the window seals, we will tell you.
Can you quote for more than one area?
Yes, we can. More than one area can go on one quote.
Do you seal inside as well as outside?
Yes. Plenty of draughts come through the inside joint as well as the outside, so sealing both is often worthwhile.
Can you seal over the old sealant?
No, it will not last. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Towns and villages near Sompting
What else we do in Sompting
What we’re called out for in Sompting
Sun, frost and rain wear sealant out. UV light hardens the outside of the bead, until it loses its stretch and starts to crack.
People normally contact us after spotting one of these:
- Damp patches on the reveal after heavy rain
- Hard, cracked sealant around windows
- Rushed sealant from a window installation
- Cold air getting in at the frame edge
For site and facilities teams at buildings such as Sompting Village Primary School, its window and door frames need their mastic kept sound, just like a home’s.
What to look for in a quote
- The length of the guarantee
- Whether they seal over old material or remove it
- What happens if they find a problem under the old sealant
- Who turns up on the day
Should I try it myself first?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
What happens on the day
A visit follows a simple pattern: we check the joints, protect the area around them, do the work and clear up. It usually takes a morning for a couple of windows and a door. For a job in Sompting, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely.
- Frame and wall are cleaned and must be dry before sealing.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
Before we arrive
- Tell us about any water getting in
- Plan for the work area to be out of bounds to pets and children
- Tell us if parking is tricky
How to get a quote
For a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. You’ll have a clear quote before work begins.